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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd15bd0f3e44bba8a455ee748efbeec8902b1fd75605aa36e4ccb965ef6baa32' 
  AND token = 'nB1DB6UZMEfCuPJ/9FzGPGMiKtfBhKzKII6PE2r9l1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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