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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0e9eb07994afe299070ff6c0bc697b0f85a1c829546a18da7226ba429f2702' 
  AND token = 'xhhaE8vCI7wFouffhvk+BywQv0Kj7CAsh1zLpNd5Mik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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