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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5ab8a6f04af8f4c1f788a75a29ac1393cd161a11bf69083ff1982bd2023137b' 
  AND token = '33Q91X0YSWjH4wZ1I0GV3/hrVejFI+nZOiuryeijGJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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