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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4548e6a2fc17b5ecea5b346c4633c63758e869e04240d4255049056a9b753a3' 
  AND token = '2Crc3r0RTRCHf8bPxaRKvT6aUprYG1JfA958Og+HZJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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