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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91dd31555d21a019ee4d025525442551cc94718fe3ec57bc27190aeba8788f3e' 
  AND token = 'LomY/Gj9gNDuuCbj9alQZBW/hlctwx2ezPjFhhcKhmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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