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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd59eab8e68c3ec35a8b8dabf0cd1172207721d74dd308dd8a834c592ad676c48' 
  AND token = 'evU9bsSQ8DxLZSixRxTc71pFOrsW5r1IbxOk9SCaOys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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