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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faeee490864a0bc49bc02987d943b46ce8b8d095783a54664fce20fb45a1309a' 
  AND token = '9xSAgErlD/df++Nek+fJyiBKEtB/yPozrQmuW1b4UX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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