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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c073466a74866e32f3248cf975ed84599bdcfb670ddc6364845b0b07aa82c5ce' 
  AND token = 'ocrjkuKOJHmhfXDdvr7iTJpMXNB5Rf2JaZ8oXg+DC48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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