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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b3c6a1353149e48688e6fbb7cbb3cf4a38215bb4975ea66be80f72d7f6f156' 
  AND token = 'KMWyqOMptF7H40Zyrx0+Xfowun7T82MSmW5J78x4++w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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