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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad787e8ec1f906b1de5f234eb68b932573651ed93db49c8466202d5788a9d1bb' 
  AND token = 'LbuJ5GS+dY0QsIrsEGKb7DCYA0Q26QFVE8lcLuwv97Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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