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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd9643a61fafdbb6706a31d3daae68cb5ddcff7d423e50158549e8786df333b' 
  AND token = 'H4lcc4OnZcHx+iyUqcAU6HFx/akK5PF5blPgQ/map7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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