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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55024085735b8a154b242c1847a851f0c2da15bb8305e27f9ff0aa14a1b6a9d2' 
  AND token = 'db451m62fcHTIhWavoWUU11pWjhFka2AHRrf5nAwBtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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