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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3a873b838b59ce9319ba5cba8ed805bfe64f80e8c427c6d7934db489f1cea8' 
  AND token = '7X5YWvBze5uuuhyrEpMmBzwiOugBftuH8UFov37oZL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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