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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1843d556a83bfde70c9b73241e9398cd374f61c6df16d7b6145dfa64deaeae' 
  AND token = 'xGryybkcx995+fXZhdFk9w9EmSM+V38Y9wxWwWpGAts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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