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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84458230e89ed59d7d6c9b72b493f61ee2f7bcd074aee56654afb3820a942dc7' 
  AND token = 'MuHHExzxvJ0gVM4v4QIxcBpD39ZU/arVlUB0nTNYrL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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