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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '158f28a3b246cba862ea794d5f635a6eeb488fa2094be30a5e365773212d21f9' 
  AND token = 'hUKwLET01mFFwi/S25eV01q16xY9uLfk7+7JXjiTsJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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