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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d2c99fff04268d884941027677b5519cfdd89ae6f2f27eafd1e650e568649e' 
  AND token = 'c1O3K2D2kqLfPruvMz/ZahW6GicgKl6RouGU8mv693Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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