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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a02ecdf5f0f38c10372b1542a27296f7e1a4ee4d2e1abeb555b5d367e8724f1' 
  AND token = 'ej1lOrtKrJJLBxjG0KBHso6QXPtibXtFxSkZqvdzDuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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