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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33e865e38697be799db7d5367b56893ef2b99f2755e301d84dc38705b4f63ea3' 
  AND token = 'TKVqW7NnW/ILyxVsc2g2N5nGus3URh2noP3Si6vcSoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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