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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8de0a5f5c06e406c04a804918fa0ac732c755d38cbd5fc24010c39898840dbcc' 
  AND token = 'dv1DSR2j8g39BZfqMCcLZqh7TKJ+6Wob9RQ50xzxToo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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