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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a981aa09ed47c53cdbc8b5e735bb83c4aa266b4dbd04d060ecb719b6b7e6840d' 
  AND token = 'z6/qwUC6XfXTf36AQe0xNyrjNIAz4+y1khBdsDbEDY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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