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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63b3d81e50a1038cc7f8050295c435824828825473b6d17fa840fb9563757cf' 
  AND token = 'bovuO4eQaBD7IhZ1xtNwHMvhCfJSSPEj5tN2874VzN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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