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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5ba35ad4c24be5ecb37a7d9db20b9706963c728d9269910a5fa9c2bbe54119b' 
  AND token = 'AWtfOgIb09Ymdh76OzTBw4nPBIGgnw5D9UvM8jN6XG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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