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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab67dba3a36592a255ac615d80b6d98651818f537356c57c53eae10f916573f7' 
  AND token = 'T8FYBVncSquBFln1xXbASFC9Hy56vy382YS3V2hxQvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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