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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0bc6099337949e2445f87c5f51d3404c208fd31cc55eec26b16a70dc58a253' 
  AND token = 'RxRxu07nHJTJq9ej5dRV0lRXUQ88H6LM9sYjOak0zaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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