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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19e4216afd7aa23f4a434d96eb4d17d90f4de40308590b03cf5016eab4b9981' 
  AND token = 'JbcA2Xci/H1f3YO242z6PDPp2p4WpULvJvDV01wPdP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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