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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f4613167af11394f879577988ab0ce5674b90e265eb5fa0dc9429466de1720b' 
  AND token = '2MNZOUiBg7+0gCQCz92zif9i+ci4GbTf+1lo5LflAAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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