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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fad3b929570fa8c8780e160bbc9540a08095424327190af136250df29c08ad3' 
  AND token = 'ZnuULSlvANckCvaXDYYfwA7+yxGS0+dMw7n5kNaWdsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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