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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab64b4bccd5502c9c29aabda93978c42a02727703bf641f7392607e98401e15' 
  AND token = 'mSpUyuffVh52sVzQt4LZhl1dslKfAf6uzeN43DqHI7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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