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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7651be0bb8f83b2fdee661e3f976f22ed655b49a04de0f0b18e3f06600c21e5' 
  AND token = 'rqMigCLaBDc6slFfhexKhnc4qI80CViAQV6cQUhClN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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