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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c166c029573b96d2f949a5ff669b10c0850df96e34ff5684607dfb68a943d205' 
  AND token = '2lw2t8EjpdsisEhGiDN8pzT1nKfzQV3eLG/NUwoDBdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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