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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eba450ebf43353a733a7a06d18367677a98d8c730ccf92a4e84d6d260b7d878' 
  AND token = 'ID9CWfB1BvcIonL9Y21VoOCOaxrqNPy4/+io/5rof/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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