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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43b850c983095279fbe4f8c6c6a098ded6fdd72ae99dd758a2edad25de5ffb49' 
  AND token = 'D0mkJHxR0db4RWkhPaSqvXDjf/DRoB/QTNapzn+toS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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