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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7687938af287eb5064600f49d422b769490e181de4cbc0bc0686c5bb4f1d5b88' 
  AND token = 'hUNpDLZx49d0Y0EijXAlOcOtEcT79IMaTcsEGgRsyD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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