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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92e60cc43b2e3e581780c530fd3747d71bdd4852b3f99bf2799ac00f8db27a6' 
  AND token = 'qJdaO9adnvko5FZBqR4hg3IFGv12saQNjvjf3dFP9IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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