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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e6e6b64ac759834da2ba7b68ebe2dc236c689392e7a70148c92d30a7b26f294' 
  AND token = 'm82xSxgmMiXFkyRY0CjxW+oRysduLegq3c9ozJn1nFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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