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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1adfdeb18e24476bfebd62263bbc79de5bd9e62e3090367370d1179dfbf69179' 
  AND token = 'Q8TkvZhqQGy3q901pevyeGuhCA+svnKptvNtQFunckA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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