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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'befe36f8f9c14bc773d621cd97c2d053d6a93f3f56dd708655d5850c135eb99f' 
  AND token = 'ZBLCkWneaV21Occ5B9KUSlObGATyH6AFn6/ovCpXCqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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