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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b1978de0269ab6e11571461cfe6b492d762e641163c82e3fef27038a6bdaecc' 
  AND token = 'N8wb2JYh1EKWLESvID3lbkJv2gV9Hi4uQHrk37Icb7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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