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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6198642c2b6bf03aad7ee5a8559bfa3ed67ca184b69c5f3a8109382c8b4ca391' 
  AND token = '/lN8Lv6u9yQhVckIWY1SPgPES/eHqfh6WzefqMWIrNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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