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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c6684a170896876967fcb2434ba6e96f26078bb2578af79a614366578868ad' 
  AND token = 'AZd7VUXETyQLD4QYV7CHatyyCuDgAptXbQbE/BXnu+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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