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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a741f272f44c2240be66b9352c936849b7d65c0ca4801efa0ee92f31f9da8ade' 
  AND token = 'FEgQbuk7vDx5scT0ys8un08fOuAwrFjV4S55esAO3uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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