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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f289c5702d83ed79c0bafdc49f28d2fcb16c25f3e4f2cb8cd1be6f29d6ab7d' 
  AND token = 'E0MHliLjQ5j3sK4cnUmu+PF63Vsn4//N/ozy0h0ZmpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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