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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15bed40f8fadc21286fe32ad45890225649a5f4ff442318b017f1144fcc3934a' 
  AND token = 'g1ycrByOLjYJngjKQJkf9m3nK1jOn0NYvlpNm3fnkTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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