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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82122dadec97716a01f6171cf9be7fe0e49484e1df51a695fd9c40f54d66cbc' 
  AND token = 'LvsfIeiFPVcA44bUZAQDyAivbex0ZlsZpIP0u197qN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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