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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7867a7ade70c8b0e5e3377df5c2d535f69ee4f86b7ff1894ffe7ebdc267012eb' 
  AND token = 'GjlngDsiWC6yChMQ/XQRWNAe99trL0KGBEZUQ/TAiUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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