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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '479bea3db5200674ea9aedec57881c7c0fd4a7595400af8032243a116f279ef4' 
  AND token = 'dIyqYILknuc/0Ku6f5/S6ntoI7NARHIRo47/daLOaCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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