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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f409880626b4a190d9aae9b80d76418b4588b12ba6e73a959a3ff40d157ac0' 
  AND token = 'R1iB0KGMn8KM6N7ATerbeV6gwhzRiugWSUWNgxxG4Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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