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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49f8ad08dcc643c0107f8eeb808711652fafb88390c5dd52a58685b4d2312280' 
  AND token = 'WSkqPFufmIwt/WuGF5ER3eL2edtOuio9byPBLqVlhHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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