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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0514f2d8f90498f486e4a810351ae670893d937f02cdf09b6b39e46694438329' 
  AND token = 'XNRg1L65u0NGRotXjmDvwNO2IZK5i8+VklcQ5SBMT5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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