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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b9eb75d4a74bc63ebee323c2ac888dd547ef1e449999297aef0b8022ba2f4bd' 
  AND token = 'jp20I6cZpUMP3GR8jJSuyvAGJFq0I/AmYZD8sNO449M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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