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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2cb7e893b82a5f7ef6289eccadfd61808b2bbb8284db54a8a0c008b9ea38c7' 
  AND token = 'fi1RFwjLi3XtO6R5zbG+pA+iquIxoLSa3Z5BZ8n6+6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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