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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7907b6915188f20b669238faa538fd127815862dea82dc05245b9e1d6baff4d' 
  AND token = 'fn7xK7VjfixThL874q8+53W9BWoj5nAHJTiJKKA0Vqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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