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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '852cb43be7f65e5455340c7e2ed13cfe49e948b158964da0444000f947c8ab77' 
  AND token = 'zoGVCxQKZlaarvaPtZdSxU8wsBn+L6Oi76L3lRn0Bmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}