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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6bda47d7118c803f1984a165101036968aba8a2b6fce9ae6883dd388156edf6' 
  AND token = 'JnmqTHe3v8AR7YBwwwLal0LVRfzzSjhMQuq0xdyIEuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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