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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02589c65482fbfc501403ae72d34be0c73715012f582bbcb7a405ec46ef954a1' 
  AND token = 'QhMFr/+ShrGDsso/14PgHdgMm7lklky8rj/InFdW6jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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