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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee15b821b257a77cbfc9c9e11b5be03e1055b5f44acdd261bb362b3aa292b8d' 
  AND token = 'cbA/RprdpYaDDK0tt5NNfgQIMKCZ1nKaiUpqr4tPf0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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