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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a85c716c74e0a789deef7b556eb15e6677b85672fce16bfdabc04062d2adcee' 
  AND token = 'qTTfT26r85opt3IunTOBfJ9cJU9ZAbyqiR55uQFOlDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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