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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '595b152795ecab400e6d96d20065aec3cda8025a09816978ecda6fff5c9d898a' 
  AND token = 'aFGJWQO8JhB9vE+7xXT+52FhpvgIrlGpkVArdhRkV8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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