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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd18dac088f5afdc64122ac3a49d61ccd6317b375288ddb8e3ad2ebe110cec62' 
  AND token = 'RjN5gOpWfjgzLbKTDOIFMHn/pZrR5xcqTFuA6EMQeZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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