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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9dfdfb69e1c76514220e3bccfb39f5d2e9b58ee3463af2d5bfcc20cf051f751' 
  AND token = '6MMt2YP4EWm1Vwm431JIQO09VEvjEJXFj+jCBtdo8hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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