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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b816372fe8c88d3c264dc51caf7614508449a90a4af41621bd1f34721be940f' 
  AND token = 'b1jUs1S+BPK+2KKMaqkTEaZLqiLYU7Drz4g9fj9eBTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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