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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23b1ce7ad1bf0dfb24e74f54611d3123e3e1e666a6939855c5a3d99ced64d2c' 
  AND token = 'neB85IQWT0VsdM0hTj/cd3DbbJLF5ALafZA14lT02Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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